Throughout the series, probably to avoid copyright infringement issues, incorrect references are made to the New York Subway system. On subway entrances, the 1, 2, and 3 lines are shown in yellow, when they are actually red. A character blames his lateness on the fact that the Q train was changed to an express, whereas in real life the Q is normally an express. See more
[looking at evidence from a murder case
I can't wrap my head around it, Mac. You get up, you go to work, see the people that you know, you talk, you laugh. You're living your life, then suddenly, boom. It's just over. Just like that, and you never even saw it coming.